If a course is not started, the course image and title on the dashboard link
to the course about page. Because the LMS course about pages do not exist
(i.e. 404) with the marketing site enabled, we simply do not use a link if
the course has not started.

If a user is already registered for a course but the course has not started
yet, display a grey button that says "you are registered" and goes nowhere
instead of the blue "access courseware" button, which goes to the LMS course
about page (which 404s).

edx.org - reduces padding on course listing register buttons

edx.org - reduces padding on course listing register buttons (all states) and resets box-sizing to border box to make a proper box model for element

Make login link button in header work with course enrollment flow

Make activation complete page use non-modal login link

Make course number in registration button not transformed to lowercase

Remove edX news from dashboard if marketing site is enabled

Return 404 for course about pages if the marketing site is enabled

When an unauthenticated user clicks the registration button for a course, they
are redirected to the registration page with query params that are ultimately
included in the form that gets submitted so they can be enrolled in the course
upon successful registration. The header login button is fixed to pass the same
query parameters to the login page so the user can be enrolled in the course
upon successful login.

It would be better to redirect to the marketing site course about pages, but
the URLs for those are not easily computed, and we do not have time to set up
a full mapping in the LMS config.

Conflicts:
	lms/envs/aws.py
	lms/envs/common.py
	lms/static/sass/base/_base.scss
	lms/templates/forgot_password_modal.html

Update "thank you" text in help modal

As per request from Mary.

Jobs page updates.

Upgrade to Backbone 1.0.0

Redirect authenticated users from registration or login to dashboard

Set SERVER_EMAIL so that mail_admins works

Remove marketing URLs from common.py

Disable SSL cert validation for Zendesk API

studio - alerts: synced up styles and sample markup

They are currently using a CA that is not installed on our servers. Since it
isn't a top-tier CA and we aren't submitting anything particularly sensitive
anyway, we don't have to feel too bad about this.

studio - alerts: synced up example HTML to show advanced settings live notification, aria roles, and action classes; integrated typography mixins

Pass through the value (either default or inherited) that a metadata field WILL have if it is not explicitly set.

The MKTG_URLS dictionary is overwritten completely in aws.py anyway, and we
shouldn't be trying to keep both the production config and LMS code in sync
with changes to the marketing site.

Hide the Comments Service API key during logging.

Backbone 1.0.0, Underscore 1.4.4

Added unit tests for safe_key() to resolve bug 392.

Fix links to honor code, ToS, and privacy policy for marketing site